This service is free for use for individuals.
Companies that want to integrate wishlist service to their websites (to add 'WishIT' button) needs to pay small license fee.
Integration goes by following instructions in WishIT API page. Companies may start to do the integration without any preliminary notice for wishsimply.com and can contact wishsimply.com once they are ready.
Wishsimply.com will monitor users' browser HTTP referer value and if lot of requests are coming from some site that have not paid license fee the site can be blocked.